CA1312842C - Extraction par champ alternatif du metal noble contenu dans de la boue de minerais - Google Patents

Extraction par champ alternatif du metal noble contenu dans de la boue de minerais

Info

Publication number: CA1312842C
Authority: CA; Canada
Prior art keywords: gold; noble metal; ore; dissolution; lixiviant
Prior art date: 1985-09-10
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Fee Related

Application number

CA000517940A

Other languages

English (en)

Inventor

Dean Butler

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Individual

Original Assignee

Individual

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1985-09-10

Filing date

1986-09-10

Publication date

1993-01-19

1986-09-10 Application filed by Individual filed Critical Individual

1993-01-19 Application granted granted Critical

1993-01-19 Publication of CA1312842C publication Critical patent/CA1312842C/fr

2010-01-19 Anticipated expiration legal-status Critical

Status Expired - Fee Related legal-status Critical Current

Links

229910000510 noble metal Inorganic materials 0.000 title claims abstract description 17
239000002002 slurry Substances 0.000 title claims abstract description 13
238000000605 extraction Methods 0.000 title description 8
239000010931 gold Substances 0.000 claims abstract description 60
PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 53
229910052737 gold Inorganic materials 0.000 claims abstract description 53
238000000034 method Methods 0.000 claims abstract description 34
239000007800 oxidant agent Substances 0.000 claims abstract description 34
230000001590 oxidative effect Effects 0.000 claims abstract description 21
230000005684 electric field Effects 0.000 claims abstract description 11
FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 48
239000011780 sodium chloride Substances 0.000 claims description 24
UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea group Chemical group NC(=S)N UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 20
XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 10
BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 7
BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 6
229910052709 silver Inorganic materials 0.000 claims description 6
239000004332 silver Substances 0.000 claims description 6
229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 4
RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 4
229910052697 platinum Inorganic materials 0.000 claims description 3
239000005708 Sodium hypochlorite Substances 0.000 claims description 2
SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical group [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 2
238000004090 dissolution Methods 0.000 abstract description 36
238000002386 leaching Methods 0.000 abstract description 19
239000000243 solution Substances 0.000 description 32
230000003647 oxidation Effects 0.000 description 25
238000007254 oxidation reaction Methods 0.000 description 25
238000013019 agitation Methods 0.000 description 21
WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 20
XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 17
NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 12
VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 9
235000019270 ammonium chloride Nutrition 0.000 description 9
239000011324 bead Substances 0.000 description 8
SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 8
238000011084 recovery Methods 0.000 description 8
239000000463 material Substances 0.000 description 7
229910015400 FeC13 Inorganic materials 0.000 description 5
238000006243 chemical reaction Methods 0.000 description 4
150000001875 compounds Chemical class 0.000 description 4
MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 description 4
150000001450 anions Chemical class 0.000 description 3
239000000460 chlorine Substances 0.000 description 3
230000000694 effects Effects 0.000 description 3
239000003792 electrolyte Substances 0.000 description 3
229910052751 metal Inorganic materials 0.000 description 3
239000002184 metal Substances 0.000 description 3
150000002739 metals Chemical class 0.000 description 3
241000487918 Acacia argyrodendron Species 0.000 description 2
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
241000196324 Embryophyta Species 0.000 description 2
VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
239000002253 acid Substances 0.000 description 2
230000015572 biosynthetic process Effects 0.000 description 2
235000011222 chang cao shi Nutrition 0.000 description 2
229910052801 chlorine Inorganic materials 0.000 description 2
ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 2
230000003247 decreasing effect Effects 0.000 description 2
239000003446 ligand Substances 0.000 description 2
239000007787 solid Substances 0.000 description 2
239000000126 substance Substances 0.000 description 2
150000004763 sulfides Chemical class 0.000 description 2
230000004580 weight loss Effects 0.000 description 2
VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
241001527806 Iti Species 0.000 description 1
238000010521 absorption reaction Methods 0.000 description 1
239000000370 acceptor Substances 0.000 description 1
FRHBOQMZUOWXQL-UHFFFAOYSA-L ammonium ferric citrate Chemical compound [NH4+].[Fe+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O FRHBOQMZUOWXQL-UHFFFAOYSA-L 0.000 description 1
239000000908 ammonium hydroxide Substances 0.000 description 1
SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 description 1
239000000440 bentonite Substances 0.000 description 1
229910000278 bentonite Inorganic materials 0.000 description 1
SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
239000012267 brine Substances 0.000 description 1
230000005587 bubbling Effects 0.000 description 1
125000002091 cationic group Chemical group 0.000 description 1
KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 1
150000001805 chlorine compounds Chemical class 0.000 description 1
230000002301 combined effect Effects 0.000 description 1
238000010276 construction Methods 0.000 description 1
238000007796 conventional method Methods 0.000 description 1
229910000366 copper(II) sulfate Inorganic materials 0.000 description 1
238000005260 corrosion Methods 0.000 description 1
230000007797 corrosion Effects 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
229960004642 ferric ammonium citrate Drugs 0.000 description 1
239000007789 gas Substances 0.000 description 1
230000005484 gravity Effects 0.000 description 1
239000001257 hydrogen Substances 0.000 description 1
229910052739 hydrogen Inorganic materials 0.000 description 1
229910052500 inorganic mineral Inorganic materials 0.000 description 1
150000002500 ions Chemical class 0.000 description 1
235000000011 iron ammonium citrate Nutrition 0.000 description 1
239000004313 iron ammonium citrate Substances 0.000 description 1
238000004519 manufacturing process Methods 0.000 description 1
239000012528 membrane Substances 0.000 description 1
235000010755 mineral Nutrition 0.000 description 1
239000011707 mineral Substances 0.000 description 1
239000000203 mixture Substances 0.000 description 1
229910052901 montmorillonite Inorganic materials 0.000 description 1
231100000614 poison Toxicity 0.000 description 1
230000007096 poisonous effect Effects 0.000 description 1
230000003134 recirculating effect Effects 0.000 description 1
239000011347 resin Substances 0.000 description 1
229920005989 resin Polymers 0.000 description 1
230000000717 retained effect Effects 0.000 description 1
150000003839 salts Chemical class 0.000 description 1
AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
235000019345 sodium thiosulphate Nutrition 0.000 description 1
HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
239000002904 solvent Substances 0.000 description 1
239000002699 waste material Substances 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/045—Leaching using electrochemical processes
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Organic Chemistry (AREA)
Metallurgy (AREA)
Mechanical Engineering (AREA)
Materials Engineering (AREA)
Manufacturing & Machinery (AREA)
Life Sciences & Earth Sciences (AREA)
Geology (AREA)
Geochemistry & Mineralogy (AREA)
General Life Sciences & Earth Sciences (AREA)
Environmental & Geological Engineering (AREA)
General Chemical & Material Sciences (AREA)
Electrochemistry (AREA)
Chemical Kinetics & Catalysis (AREA)
Manufacture And Refinement Of Metals (AREA)

CA000517940A 1985-09-10 1986-09-10 Extraction par champ alternatif du metal noble contenu dans de la boue de minerais Expired - Fee Related CA1312842C (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
AUPH02367		1985-09-10
AUPH236785		1985-09-10

Publications (1)

Publication Number	Publication Date
CA1312842C true CA1312842C (fr)	1993-01-19

Family

ID=3771269

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA000517940A Expired - Fee Related CA1312842C (fr)	1985-09-10	1986-09-10	Extraction par champ alternatif du metal noble contenu dans de la boue de minerais

Country Status (11)

Country	Link
US (1)	US4980134A (fr)
CN (1)	CN1008446B (fr)
AU (1)	AU585390B2 (fr)
BR (1)	BR8604310A (fr)
CA (1)	CA1312842C (fr)
GB (1)	GB2181452B (fr)
MY (1)	MY101543A (fr)
NZ (1)	NZ217504A (fr)
PH (1)	PH21188A (fr)
ZA (1)	ZA866798B (fr)
ZW (1)	ZW18286A1 (fr)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CH672925A5 (fr) *	1988-09-19	1990-01-15	Hana Dr Sc Nat Frauenknecht
MY105658A (en) *	1989-03-07	1994-11-30	Butler Dean R	Noble metal recovery
GB8914037D0 (en) *	1989-06-19	1989-08-09	Univ Cardiff	Dissolving values of platinum group metals from ores and concentrates
NZ237011A (en) *	1990-02-23	1992-06-25	Cra Services	Extraction and recovery of gold by treatment with an acidic lixiviant solution
US5114687A (en) *	1990-12-14	1992-05-19	South Dakota School Of Mines & Technology	Ammonia extraction of gold and silver from ores and other materials
US5328669A (en) *	1993-01-26	1994-07-12	South Dakota School Of Mines And Technology	Extraction of precious metals from ores and other precious metal containing materials using halogen salts
US5308381A (en) *	1993-04-15	1994-05-03	South Dakota School Of Mines & Techology	Ammonia extraction of gold and silver from ores and other materials
US5542957A (en) *	1995-01-27	1996-08-06	South Dakota School Of Mines And Technology	Recovery of platinum group metals and rhenium from materials using halogen reagents
RU2121517C1 (ru) *	1998-01-29	1998-11-10	Карманников Владимир Павлович	Способ извлечения и разделения платины и палладия
GB2349876B (en) *	1999-05-10	2003-03-05	Rio Tinto Technology Dev Ltd	Process for the Recovery of Noble Metals
US6660059B2 (en) *	2000-05-19	2003-12-09	Placer Dome Technical Services Limited	Method for thiosulfate leaching of precious metal-containing materials
US7722840B2 (en)	2002-11-15	2010-05-25	Placer Dome Technical Services Limited	Method for thiosulfate leaching of precious metal-containing materials
US20040237721A1 (en) *	2003-05-29	2004-12-02	Morteza Baghalha	Anoxic leaching of precious metals with thiosulfate and precious metal oxidants
WO2006113284A2 (fr) *	2005-04-13	2006-10-26	Metals Recovery Technology Inc.	Processus de recuperation de metaux du groupe des platineux, de rhenium et d'or
US7964015B2 (en) *	2007-05-23	2011-06-21	Contact Marketing Solutions, Llc	Metal extraction without cyanide
RU2394109C1 (ru) *	2009-01-11	2010-07-10	Закрытое Акционерное Общество "Уралкалий-Технология"	Способ сорбционного извлечения благородных металлов
CN101818258B (zh) *	2010-05-10	2011-07-06	梁伟基	一种混合浸出剂快速浸出金银的方法
EP2576850B1 (fr) *	2010-06-01	2015-03-04	Voldemars Belakovs	Procédé de récupération de métaux nobles et d'autres sous-produits à partir d'un minerai
WO2012076981A1 (fr)	2010-12-07	2012-06-14	Barrick Gold Corporation	Résine en lixiviation à co-courant et à contre-courant dans des procédés de lixiviation d'or
AR086933A1 (es)	2011-06-15	2014-01-29	Barrick Gold Corp	Metodo para recuperar metales preciosos y cobre de soluciones de lixiviado
CN103103348B (zh) *	2012-12-31	2014-10-29	长沙铂鲨环保设备有限公司	一种类卤化合物的应用
US8931642B2 (en)	2013-01-14	2015-01-13	William D. Simmons	Activated flotation circuit for processing combined oxide and sulfide ores
RU2540236C2 (ru) *	2013-05-07	2015-02-10	Федеральное государственное бюджетное учреждение науки Институт химии Дальневосточного отделения Российской академии наук (ИХ ДВО РАН)	Способ переработки высокоуглеродистых золотоносных пород
US10161016B2 (en)	2013-05-29	2018-12-25	Barrick Gold Corporation	Method for pre-treatment of gold-bearing oxide ores
CN103937975B (zh) *	2014-03-25	2016-09-14	陕西锌业有限公司	从湿法炼锌浮选银精矿中直接提取银的方法
WO2015175251A1 (fr)	2014-05-12	2015-11-19	Summit Mining International Inc.	Procédé de lixiviation de saumure pour la récupération de métaux de valeur à partir de matériaux oxydés
US11993826B2 (en)	2018-05-15	2024-05-28	Hycroft Mining Holding Corporation	Alkaline oxidation methods and systems for recovery of metals from ores
PE20211512A1 (es)	2019-01-21	2021-08-11	Barrick Gold Corp	Metodo para la lixiviacion con tiosulfato catalizado con carbon de materiales que contienen oro
CN111809063B (zh)	2019-04-12	2021-10-22	上海师范大学	一种光催化金属溶解方法
EP3967661B1 (fr) *	2020-09-09	2023-07-26	Northvolt AB	Procédé de préparation de solutions de sulfate de métal de qualité de batterie
CN118028904B (zh) *	2024-01-12	2024-10-18	武汉理工大学	一种硫代硫酸盐电化学氧化浸出贵金属的方法
CN117887977B (zh) *	2024-01-12	2024-10-18	武汉理工大学	一种电化学氧化选择性分步浸出电子废弃物中Au、Ag的方法

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* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2761829A (en) *	1951-06-29	1956-09-04	Norman H Dolloff	Polarization prevention in electrolysis of sulfide ores
US3957601A (en) *	1974-05-17	1976-05-18	Mineral Research & Development Corporation	Electrochemical mining
US4071278A (en) *	1975-01-27	1978-01-31	Carpenter Neil L	Leaching methods and apparatus
US4206024A (en) *	1975-01-27	1980-06-03	Darrell G. Lochte	Electrochemical leaching methods
US4139432A (en) *	1976-08-16	1979-02-13	Ghiringhelli Hugh A	Process for electrochemically recovering precious metals from ores
US4128462A (en) *	1976-08-16	1978-12-05	Ghiringhelli Hugh A	Electrochemical process for recovering precious metals from their ores
US4204922A (en) *	1977-12-06	1980-05-27	The Broken Hill Propietary Company Limited	Simultaneous electrodissolution and electrowinning of metals from simple sulphides
IT1228590B (it) *	1982-08-05	1991-06-24	Dextec Metallurg	Procedimento per il recupero di argento e oro dai minerali e dai loro concentrati
ZA84929B (en) *	1983-02-22	1984-09-26	Sueddeutsche Kalkstickstoff	Hydrometallurgical recovery of noble metals using thiourea
AU2534984A (en) *	1983-03-02	1984-09-06	Shepherdson Building Pty. Ltd.	Recovery of gold electrolytically from pulp

1986
- 1986-09-03 PH PH34212A patent/PH21188A/en unknown
- 1986-09-03 ZW ZW182/86A patent/ZW18286A1/xx unknown
- 1986-09-03 GB GB8621306A patent/GB2181452B/en not_active Expired
- 1986-09-08 ZA ZA866798A patent/ZA866798B/xx unknown
- 1986-09-09 BR BR8604310A patent/BR8604310A/pt unknown
- 1986-09-09 CN CN86106986A patent/CN1008446B/zh not_active Expired
- 1986-09-09 NZ NZ217504A patent/NZ217504A/xx unknown
- 1986-09-09 AU AU62523/86A patent/AU585390B2/en not_active Ceased
- 1986-09-09 US US06/905,690 patent/US4980134A/en not_active Expired - Fee Related
- 1986-09-10 CA CA000517940A patent/CA1312842C/fr not_active Expired - Fee Related
1987
- 1987-02-04 MY MYPI87000089A patent/MY101543A/en unknown

Also Published As

Publication number	Publication date
NZ217504A (en)	1988-08-30
CN86106986A (zh)	1987-08-05
GB8621306D0 (en)	1986-10-15
CN1008446B (zh)	1990-06-20
AU585390B2 (en)	1989-06-15
US4980134A (en)	1990-12-25
PH21188A (en)	1987-08-12
GB2181452A (en)	1987-04-23
GB2181452B (en)	1989-06-07
MY101543A (en)	1991-12-17
ZW18286A1 (en)	1987-05-27
BR8604310A (pt)	1987-05-05
AU6252386A (en)	1987-03-12
ZA866798B (en)	1987-05-27

Legal Events

Date	Code	Title	Description
2000-01-19	MKLA	Lapsed

Publication	Publication Date	Title
CA1312842C (fr)	1993-01-19	Extraction par champ alternatif du metal noble contenu dans de la boue de minerais
US4551213A (en)	1985-11-05	Recovery of gold
EP3655557B1 (fr)	2023-07-05	Procédé de récupération de métaux précieux
US4128462A (en)	1978-12-05	Electrochemical process for recovering precious metals from their ores
US20190233917A1 (en)	2019-08-01	Methods, Materials and Techniques for Precious Metal Recovery
AU587494B2 (en)	1989-08-17	Leaching precious metals using n-halonydanton
US4139432A (en)	1979-02-13	Process for electrochemically recovering precious metals from ores
US5401296A (en)	1995-03-28	Precious metal extraction process
US10563283B2 (en)	2020-02-18	Methods, materials and techniques for precious metal recovery
NZ205153A (en)	1985-08-30	Hydrometallurgical process for recovery of gold or silver from ores
US20080302671A1 (en)	2008-12-11	Sequential lixivation and precipitation of metals from refractory ores by utilising variable oxidation reduction potentials and a variable PH system
US20210292927A1 (en)	2021-09-23	Method for refining bismuth
Ardiwilaga	1999	Effects of cysteine and oxygen on recovery of cemented gold from leach liquors in a thiourea system
Ilyas et al.	2018	Halide leaching of gold
US4381225A (en)	1983-04-26	Production of lead from ores and concentrates
Tran	1992	The hydrometallurgy of gold processing
Schmidt et al.	1993	Carbon adsorption and leaching of gold by acid thiourea
AU558740B2 (en)	1987-02-05	Recovery of silver and gold from ores and concentrates
Scheiner et al.	1972	Recovery of silver and mercury from mill tailings by electrooxidation
Arslan et al.	2003	Electrooxidation of gold-bearing sulfide concentrate
Abrantes et al.	1994	Pretreatment by electrolytic or oxidative leaching for recovery of gold and silver from refractory sulphide concentrates
GB2154221A (en)	1985-09-04	Extraction process